I see. So do you disagree with the distinction between say.... Shia and Sunni?
I would not dare consider Shia Muslims. Shi'ism is the blending of pre-Islamic Persian customs with Islam and it makes a convoluted mess of things. Shia claim that Ali is a divine being along with Muhammad which goes directly against al-Qur'an as disavows Muhammad's claim in Surah Al-Baqara ayat 23....
"وَإِن ڪُنتُمۡ فِى رَيۡبٍ۬ مِّمَّا نَزَّلۡنَا عَلَىٰ عَبۡدِنَا فَأۡتُواْ بِسُورَةٍ۬ مِّن مِّثۡلِهِۦ وَٱدۡعُواْ شُهَدَآءَكُم مِّن دُونِ ٱللَّهِ إِن كُنتُمۡ صَـٰدِقِينَ"
"And if ye are in doubt concerning that which We reveal unto our slave (Muhammad), then produce a surah of the like thereof, and call your witness beside Allah if ye are truthful."
Shia also curse Aisha during their prayers as a sick version of Tashahhud. They display intense hatred towards Muhammad's beloved wife which is as un-Muslim as one can be.
Getting back on topic though. There are numerous Sufi orders and Sunnis madhahib and each adheres to different teachings by emphasizing certain hadith and ritualistic customs which have no importance in Islam. They are just mind control mostly and the only difference placed between a Muslim should be Sunni and Sufi since Sufi is a mystical branch that teaching unnecessary acts but worthwhile nonetheless. Criticizing hadith should be a priority of all Muslims since ahadith are used to manipulate and control Muslims needlessly. There are valid hadith but I fear that a lot which has been used today is purely created dogma.